Question # 1

Which of the following material has longer half life

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radium

polonium

radium

uranium

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

The conventional current is the name given to current due to flow of

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Positrons

Positive charges

Negative charges

Both A and C

None of these

A fluid at a certain point has 50 J of potential energy per unit volume, 75 J of kinetic energy per unit volume,and 35 J of pressure energy per unit volume. the total energy of the fluid is

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125 J

90 J

160 J

85 J

The velocity of sound in air not effected by changes in

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Moisture contents in air

Temperature of air

The atmosphere pressure

The composition of air

Another mean of electric potential energy per unit charge is given by:

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Electric intensity

Potential gradient

Electric Flux

Potential difference

None of these

Field lines are closer to each other in the region where the filed is

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Stronger

Weaker

Much weaker

Absent

None of these

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

The current that flows through the coil of a motor causes

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Its shaft to revolve

Its brushes to rotate

Motor to move

Its shaft to rotate

None of these

When the different streamlines cannot cross each other, then this condition is known as

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continuity condition

turbulent flow condition

steady flow condition

none of them

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

When there are number of forces acting on a body and the body is

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At rest

Motion

Rest or moving with uniform velocity

None of these

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream line body

None of these

The limit of which a microscope can be used to resolve details of an object, demands

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Wider objective and light of short wavelength

Narrow objective and light of short wavelength

Narrow objective and light of longer wavelength

None of these

Two row boats moving parallel in the same direction and pulled toward each other due to the application of Bernoulli's equation

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Stake's theorem

Toricelli's theorem

Venturi relation

None of these

In case of uniform circular motion which of the following physical quantity do not remain constant?

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Speed

Momentum

Kinetic energy

Mass

The number 134.7 should be written as

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13.47 × 10²

1.347 × 10²

13.47 × 10³

None of these

The maximum stress that a material can withstand is known as

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plastic point

elastic point

yield point

ultimate tensile strength

The typical speed of light, radio-waves, X-rays microwaves is

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28,000,0000 ms^-1

29,000,0000 ms^-1

30,000,0000 ms^-1

None of these

The work done in an equipotential surface is

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Maximum

Infinite

Zero

None of these

Who discovered the inverse square law of gravity

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Einstein

Newton

Compton

Fermi

The capacitance of capacitor depends on the

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Medium between two plates

Charge stored

Distance between the two plates

All of them

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